It's welded - two balls in bottom and one small pipe in front. Rear upper mount is hole from fender struts. It's fast and easy - I can mount/dismount sidecar on fury in 5-10 minutes. Ill make photo in few dayscan you post pics of how you attached the sidecar? I have a goldwing + sidecar rig for going places with my daughter, never really considered putting one on the fury, but that looks good!
Sidecar is not finished yet, lots of small parts should be done in future... However I really like riding with it.